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Probing the magnetic polaron state in the ferromagnetic semiconductor HgCr2Se4 with muon-spin spectroscopy and resistance-fluctuation measurements [dataset] Open Access

Combined resistance noise and muon-spin relaxation (μSR) measurements of the ferromagnetic semiconductor HgCr2Se4 suggest a degree of magnetoelectric coupling and provide evidence for the existence of isolated magnetic polarons. These form at elevated temperatures and undergo a percolation transition with a drastic enhancement of the low-frequency 1/f-type charge fluctuations at the insulator-to-metal transition at ∼95–98 K in the vicinity of the magnetic ordering temperature TC∼105–107 K. Upon approaching the percolation threshold from above, the strikingly unusual dynamics of a distinct two-level fluctuator superimposed on the 1/f noise can be described by a slowing down of the dynamics of a nanoscale magnetic cluster, a magnetic polaron, when taking into account an effective radius of the polaron depending on the spin correlation length. Coinciding temperature scales found in μSR and noise measurements suggest changes in the magnetic dynamics over a wide range of frequencies and are consistent with the existence of large polarized and domain-wall-like regions at low temperatures, that result from the freezing of spin dynamics at the magnetic polaron percolation transition.

Descriptions

Resource type

Dataset

Contributors

Creator: Mitschek, Merlin ¹
Creator: Hicken, Thomas ²
Creator: Yang, Shuai ³
Creator: Wilson, Murray ²
Creator: Pratt, Francis ⁴
Creator: Wang, Chennan ⁵
Creator: Blundell, Stephen ⁶
Creator: Li, Zhilin ³
Creator: Li, Yongqinq ³
Creator: Lancaster, Tom ²
Contact person: Lancaster, Tom ²
Creator: Muller, Jens ¹

¹ Goethe University Frankfurt, Germany
² Durham University, UK
³ Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, China
⁴ ISIS Pulsed Neutron and Muon Facility, UK
⁵ Paul Scherrer Institut, Switzerland
⁶ Oxford University, UK

Funder

Engineering and Physical Sciences Research Council

Research methods

Other description

In addition to these data, raw data measured at ISIS Neutron and Muon Source can be obtained from the following DOI:  https://doi.org/10.5286/ISIS.E.RB2010313

Keyword

Colossal magnetoresistance
Domain walls
Ferromagnetism
Metial-insulator transition
Percolation
Polarons

Subject

Location

Language

English

Cited in

doi:10.1103/PhysRevB.105.064404

Identifier

ark:/32150/r29k41zd542
doi:10.15128/r29k41zd542

Rights

Creative Commons Attribution 4.0 International (CC BY)

Publisher

Durham University

Date Created

File Details

Depositor

T. Lancaster

Date Uploaded

26 January 2022, 09:01:28

Date Modified

8 February 2022, 09:02:03

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File format: zip (ZIP Format)

Mime type: application/zip

File size: 204225

Last modified: 2022:02:02 17:32:48+00:00

Filename: durham_collections.zip

Original checksum: aa7f640287614ac12d4aa71e925dcb87